[PATCH] nfs: check return value of various rpc calls

[Uwe Kleine-König]

Hello Sascha,

On Mon, Nov 02, 2020 at 10:14:29AM +0100, Sascha Hauer wrote:
> On Fri, Oct 30, 2020 at 12:36:14PM +0100, Uwe Kleine-König wrote:
> > Check more carefully for failing requests. This improves the error
> > message when trying to mount a non-exported nfs directory from:
> > 
> > 	nfs_mount_req: file handle too big: 44831
> > 
> > to
> > 
> > 	nfs_mount_req: Mounting gave error NFS3ERR_ACCES(0xd)
> > 
> > .
> > 
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
> > ---
> >  fs/nfs.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++-------
> >  1 file changed, 81 insertions(+), 10 deletions(-)
> > 
> > diff --git a/fs/nfs.c b/fs/nfs.c
> > index 15ddab7915df..0be32322fb65 100644
> > --- a/fs/nfs.c
> > +++ b/fs/nfs.c
> > @@ -636,13 +636,33 @@ static uint32_t *nfs_read_post_op_attr(uint32_t *p, struct inode *inode)
> >  	return p;
> >  }
> >  
> > +static int nfserror_to_err(u32 nfserror, const char **errorname)
> > +{
> > +#define E(NFSERR, ERR)			\
> > +	case NFSERR:			\
> > +		*errorname = #NFSERR;	\
> > +		return -ERR
> > +
> > +	switch (nfserror) {
> > +	E(NFS3_OK, 0);
> > +	E(NFS3ERR_NOENT, ENOENT);
> > +	E(NFS3ERR_IO, EIO);
> > +	E(NFS3ERR_ACCES, EACCES);
> > +	E(NFS3ERR_NOTDIR, ENOTDIR);
> > +	E(NFS3ERR_NAMETOOLONG, ENAMETOOLONG);
> 
> You convert the NFS error codes to the corresponding error codes. For
> these we already have strings, so why not just print them with %pe rather
> than returning another string from this function?

When I started this function I wasn't aware that this is a real 1:1
mapping (i.e. s/NFSERR_/E/) and I considered it useful that the error
name (as it appears in the NFS3-RFC) is part of the error message. With
some distance to this patch just skipping the errorname part looks fine
for me.

I will rework that.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |
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